LiftMaster LM3800W Mode D'emploi page 18

The door reverses for no apparent reason and garage door opener lights don't blink:
• Check that cable tension monitor is correctly installed. If one of the cable tension monitors is removed, unplug both monitors from the opener.
Then plug in the monitor you wish to use and unplug and plug in the opener three times to relearn the monitor to the opener.
The 1k resistor provided is for trouble shooting the CTM set up only. According to EN12453 the cable tension monitor must be installed for
proper detection of cable slackness.
• Is something obstructing the door? Pull the emergency release handle. Operate the door manually. If it is unbalanced or binding, call a trained
door systems technician.
• Clear any ice or snow from the garage floor area where the door closes.
• Review Point 20.
Repeat safety reverse test after adjustments.
My door will not close and the light blinks:
The infrared photocells must be connected and aligned correctly before the garage door opener will move in the down direction.
• Verify the infrared photocells are properly installed, aligned and free of any obstructions.
The garage door opener strains to operate door:
• The door may be out of balance or the springs may be broken. Close the door and use the emergency release handle to disconnect the door.
Open and close the door manually. A properly balanced door will stay in any point of travel while being supported entirely by its springs. If it does
not, disconnect the garage door opener and call a trained door systems technician.
The garage door opener motor hums briefly, then won't work:
• The garage door springs may be broken. See above.
• If the problem occurs on the first operation of the garage door opener, door may be locked. Disable the power door lock.
The garage door opener won't operate due to power failure:
• Manually open the power door lock.
• Use the emergency release handle to disconnect the door. The door can be opened and closed manually. When power is restored, pull manual
release a second time.
• Disable any door locks. Use the emergency release handle to disconnect the door. The door can be opened and closed manually.
Door loses limits:
• Collar not tightened securely. Tighten collar and reprogram limits (see Point 20).
The garage door opener moves when the door is in operation:
• Some minor movement is normal for this product. If it is excessive the collar will wear prematurely.
• Check to make sure the torsion bar is not moving left/right excessively.
• Check to make sure the torsion bar is not visibly moving up and down as it rotates.
• Check that the opener is mounted at a right angle to the jackshaft. If not, move the position of the mounting bracket.
Automatic door lock connector will not fit the door opener plug:
• Older model 24V door locks are incompatible. Use automatic door lock model 841EU, see Accessories page
Automatic garage door lock does not activate when garage door opens or closes:
• In battery backup mode, the automatic garage door lock will unlock when the garage door is opened, and will remain disabled until power is
restored.
The door opener is beeping:
• Indicates unattended closure. The opener has been activated by the MyQ App or the Garage and Gate Monitor.
• A solid orange LED with beep, sounding approximately every 2 seconds, indicates the door opener is operating on battery power.
• A flashing orange LED with beep, sounding every 30 seconds, indicates the battery is low.
• A solid red LED with beep, sounding every 30 seconds, indicates the 12V battery will no longer hold a charge and needs to be replaced.
The garage door is beeping and the red LED is flashing:
The battery charge is low or the battery is dead.
• Replace the battery.
MyQ Smartphone Control, wireless MyQ devices, and Timer-To-Close will not work:
• When in Battery Backup mode, MyQ Smartphone Control, wireless MyQ devices and Timer-To-Close will be disabled.
• MyQ Remote LED Light and infrared photocells must be installed to enable use of Timer-to-Close or MyQ Smartphone Control of the door. Plug
in the MyQ Remote LED Light and make sure it is programmed to the garage door opener. It may take up to 5 minutes to enable Timer-to-Close
and MyQ Smartphone Control.
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